Galls beside midrib of alder leaf - geograph.org.uk - 957964

Description:

Summary[edit] Description: English: Galls beside midrib of alder leaf. Two kinds of leaf gall were present in abundance on the native alder trees (Alnus glutinosa) in this area; both kinds could often be found on the same tree. Those shown in this photo are caused by the gall mite species Eriophyes inangulis; as the specific part of that name suggests, they grow in the angles between the midrib of the leaf and the side veins. They are about 5 mm long, and, as can be seen, are elongated in the direction of the midrib. On the underside of the leaf, the openings of the galls are quite prominent; they are fringed with brown hairs. The other variety of gall that was present on these trees is shown here: 957963. Date: 10 September 2008. Source: From geograph.org.uk. Author: Lairich Rig. Camera location55° 57′ 52″ N, 4° 34′ 40″ W View all coordinates using: OpenStreetMap 55.964450; -4.577800. Object location55° 57′ 52″ N, 4° 34′ 39″ W View all coordinates using: OpenStreetMap 55.964450; -4.577600.